St. Tammany farmer. [volume] (Covington, La.) 1874-current, 1887-02-26
CONTINUOUS CROPPING.

Tho Growth Of Barley for Thirty Success
silva Years ON the Same Soil.
DR.. Gilbert has recently been dis
coursing to the students of the Royal
Agricultural College Of England about
the growth of barley for thirty years OF
more i'm succession on the same land
and treated in many different ways ON
different plots. Two Of these plots un-
MANFRED during the whole period show
how well-tillcd soil can bear such a
strain in the course of great fluctuations
due to the varying seasons: the crops
ranged from 6 IA bushels per acre up
to more than 80 bushels.
The average yield of the last sixteen
years was third less than that of the
first sixteen years; but. on the other
hand. the yield Of the last four years
was greater than of any other four
years of the last period OF ssxteen years.
The decline was more rapid than i'm the
case Of wheat, for the reason. DIR. Gilbert
thinks. that barley is naturally more
shallow feeder than wheat, and its
more limited feeding ground is sooner
exhausted.
MANFRED continuously with farm-yard
manure at the heavy rate of fourteen
tons to the acre the crop increased. but
not in any proportion to the amount of
f,cd supplied. In the first twenty years
that this plot was thus MANFRED 1900
pounds of nitrogen were put in the soil.
but less than seventh of this was re-
covered in the crops: If the other six.
seventies were all left in the soil in a
reasonably available condition. it should
Ne sufficient for the nitrogen supply Of
$50 crops Of barley as large as the
average annual yield Of the preceding
twenty years.
Analysis of the soil at the end Of
twenty years Of this manuring proving
the presence Of over twice as much
nitrogen rs in the soil of the unmanured
plot, showed that it was not leached
out From this time on this plot was
divided; on one half the heavy manur.
ing was continued, while the other hall
was left without any manuring; this
half gave much better crops than the
plot which had received no manurine
from the beginning; but the yield
diminished from year to year in spite
of the very large quantity of nitro
gen accumulated there; this nitro
gen being mostly in insoluble com.
pounds, and unavailable for immediate
use, was less effective than that of the
stable manure, a portion Of which is
soluble and at once available.
Every decently cared-for soil. ana
even many soils that have been much
abused. contain large stores Of these
insoluble nitrogen compounds. which
would he worth much to the country il
they would be rapidly utilized. In
some localities the conditions as to soil
or climate. or both, are so favorable to
its conversion into soluble forms that
manures appear to be of
little account; and those who are SO
fortunate as to live in such places
preach with increasing ae>iduity the
entirely untenable and unreasonable
doctrine that heterogeneous manuring is
Of no use anywhere.
A different mode of cropping, with I.
less heavy manur:ng. would have told
q different story as to the amount of
nitrogen of the manure recoverable i'm
the produce; rotation including. with
the barley. Indian corn. roots or clover.
heavier feeders. and feeding during a
larger part of the season while the i'm
portant process of notification is going
On. would take up more of the nitrogen
than the shallow-rooted and short-lived
barley. The farmer would thus get
more Of an immediate return for the cx.
pense Of the plant-food put in the soil.
and moreover save more of the nitrogen
from being utterly lost to him by leach
ing through the soil into the drains and
water courses as it is slowly converted
into soinbie nitrogen.-Dr. 9. c. Cald.
lOeI. IN N. y Tribune